I've been reading up on the unleaded fuel issues some of our older engines face. I guess the lead in the old gas engines coated the valves to help protect the exhaust valves from being burned. Soooo if we don't know the existing originality of our valves in our pre mid 70's engines, it is posible to be burning our valves using our only gas choice-unleaded!
I remember in High School our shop teacher talking about this, back in 1978. Some guys then were adding two head gasgets to their engines to avoid this.
Are any of you doing the same, or adding any additive to the gas for these problems! Will rebuilding the heads and changing out the valves fix this problem? Do the valve seats also have to be replaced. My engine seems fine right now, but good to know these things(mine's a 71).